E.T. Seton Park Major Maintenance Project

E.T. Seton Park Major Maintenance Project

May 13, 2021

Presented by:Ashour Rehana, Manager of Capital & Special Projects, TRCADivya Sasi, Project Manager, TRCAMichael Brierley, Fluvial Processes Specialist, Palmer

With support from:Matthew Johnston, Associate Director, Erosion Risk Management, TRCAJen Paterson, Ecologist, PalmerRobin McKillop, Principal Fluvial Geomorphologist, Palmer

Class Environmental Assessment Public Information Centre #2

We respectfully acknowledge the landswe are situated on are TraditionalTerritories and Treaty Lands, in particularthose of the Mississaugas of the Credit,as well as the Anishinaabeg of theWilliams Treaty First Nations, the Huron-Wendat, the Haudenosaunee, and arenow home to many diverse First Nations,Inuit and Métis peoples.

As stewards of land and water resourceswithin the greater Toronto region theToronto and Region ConservationAuthority (TRCA) appreciates andrespects the history and diversity of theland and is grateful to have theopportunity to work and meet in thisterritory.

Toronto and Region Conservation Authority 2

Land Acknowledgement

• All attendees are muted• All questions are to be submitted in writing only in

the Question box• Your questions are only visible to the meeting

organizers• Questions can be submitted at any time during

the presentation or Q&A session• Questions will be answered during the Q&A

session at the end of the presentation• This presentation will be recorded to ensure it is

available to interested individuals who are not able to attend


Housekeeping

TRCA & Erosion Risk Management Program (ERMP) Project Team Project Study Area Environmental Assessment (EA) Process Summary of Public Consultation Feedback Overview of Preferred Alternatives Summary of Impacts and Mitigation Next Steps Question & Answer Session


Agenda

POLLS1. What is your interest in the

E.T. Seton Park Major Maintenance Project?

Local Resident/Trail & Park User

Government Agency/Municipal Staff Member

Community Group Member Indigenous Group Member Other

2. Were you able to attend PIC #1 or review materials from PIC #1?

Yes

No

Toronto and Region Conservation Authority


TRCA & Erosion Risk Management Program (ERMP)

ERMP

•Identifies shoreline and valley land erosion hazards

•Monitors erosion hazards and erosion control structures

•Remediates erosion hazards through risk-based prioritization

TRCA

• Manages flood and erosion risk

• Protects public safety, infrastructure, property

• Funded by municipal partners

Before

After

Ashour Rehana, Manager, Capital & Special Projects

Divya Sasi, Project Manager


Project Team

Robin McKillop, Principal Fluvial Geomorphologist

Michael Brierley, Fluvial Processes Specialist

Jen Paterson, Ecologist

Brian Greck, Sr. Water Resources Engineer

CONSULTANTS COLLABORATOR


Project LocationOntario Science CentreE.T. Seton Park

Taylor Massey Creek


Priority Areas

Undermined outfall near trail and sewer

Collapse of gabion protecting sewer

Collapse of gabion protecting trail

Collapse of gabion near parking lot

56

7 418

17

42

24

25

Area 1

Area 2

Area 3

Environmental Assessment Process

Public Consultation

The EA process guarantees opportunities for public participation throughout the planning of the project.

Conservation Ontario’s Class Environmental Assessment for Remedial Flood and Erosion Control Projects

Objective: Identify the best solution to address erosion issues threatening trails, parkland, and sewer

infrastructure, within each Priority Area


Erosion Risk Analysis

Concept Alternatives

Preferred Concept

Project Plan

ProjectApproval

2019 Fall 2020 Spring/Summer 2021

Summer/Fall 2021

Fall 2021

*Future project timelines are subject to change

Summary of Public Consultation Feedback


GENERAL • Recognition of the wildlife corridor function of the valley for deer• Importance of coordination with Metrolinx Ontario Line Project

PRIORITY AREA 1 • Concern for use of embedded log/wood debris boulder revetment in area

prone to high water events• Concern for proximity of parking lot to eroding bank

PRIORITY AREA 2 • Support for Preferred Alternative and proposed pocket wetland feature

PRIORITY AREA 3 • Impacts to adjacent recreational uses (disc golf facilities, West Don Trail)


Ontario Line & Priority Areas


Priority Area 1 – Adjacent to Parking Lot

Mountain bike trailConcept Alternatives:• Do Nothing• 1 – Vegetated Boulder Revetment and Benching of Inner Bank• 2 – Truncated Vegetated Boulder Revetment and Benching of Inner Bank• 3 - Localized Cut/Benching of Inner Bank and Vegetated Boulder Revetment

Priority Area 1 – Drone Footage


Collapsed gabion basket erosion control structure

Pinch Point

South bank erosion

Summary of Evaluation for Area 1

Legend



Concept Alternative 3 – Localized Benching of Inner Bank and Vegetated Boulder Revetment (Preferred)

Vegetated boulder revetement with staggered embedded large wood

Increased channel width

Existing riparian area to remain

unchanged

Smooth channel shape

Grade control structure (e.g riffle,

armourstone rib)


Widened Channel

Toe of revetment below channel bottom

Vegetation (willow stakes) add additional

roughness

Embedded large wood

Concept Alternative 3 – Localized Benching of Inner Bank and Vegetated Boulder Revetment (Preferred)


Priority Area 2 – South of Trail Fork

Concept Alternatives:• Do Nothing• 1 - Vegetated Boulder Revetment and Benching• 2 - Up-Valley Meander Translation• 3 - Channel Realignment with Grade Controls



flow

Collapsed and separated concrete drainage pipe

Collapsed gabion basket erosion control structure

Approx. sanitary sewer alignment


Summary of Evaluation – Area 2

Legend


Concept Alternative 3 – Channel Realignment with Grade Controls (Preferred)

Live stakes and/or brush layers

Increased separation between channel and

infrastructure

New bed habitat (riffle-pool-riffle)


New and widened channel width

Regraded and vegetated inner bankRestored and

naturalized area with pocket wetland

New riffle and improved aquatic habitat

Concept Alternative 3 – Channel Realignment with Grade Controls (Preferred)


Priority Area 3 – Adjacent to Archery Range

Concept Alternatives:• Do Nothing• 1 - Trail Realignment with Repositioning of Private Outfall• 2 - Trail Realignment with Repositioning Private Outfall and Channel Enhancement• 3 - Vegetated Boulder Revetment *Revised with grade controls



Failed wood retaining wall

Start of failing gabion basket wall

Existing drainage pipe

flow

Eroding bank close to trail

flow

flow


Summary of Evaluation – Area 3

Legend


Concept Alternative 3 – Vegetated Boulder Revetment and Grade Control (Preferred)

Trail alignment to remain

Outfall to remain in same location

Removal of wood retaining wall

Vegetated boulder revetment and regrading

Regrading and widening of inner bank

Grade control structure downstream of sanitary crossing (e.g. riffle, armourstone rib)

Vegetated boulder revetment bank

protection


Concept Alternative 3 – Vegetated Boulder Revetment and Grade Control (Preferred)

Boulder toe erosion protection (inhibits erosion of new outfall channel mouth)

Riparian habitat unchanged

Removal of failed gabion basket wall and replaced with boulder revetment

Widening of channel to remove pinch-point

New riparian plantings


Impact to Disc Golf Course

Mitigation Measures• Construction Best Management

Practices will be used for noise, dust, vibration, spill control, sediment control and soil management

• Application of TRCA Erosion and Sediment Control Guidelines

• Environmental construction monitoring• Embedded large wood in bank

treatments to increase roughness and minimize downstream energy transfer

Effects• Potential noise, dust and vibration

impacts to adjacent properties during construction

• Potential spills during construction could affect soil and surface water quality

• Increase in channel width and inclusion of pocket wetland (Area 2) will have a positive effect (improved water quality and habitat diversity)

• Erosion mitigation will be constructed where existing infrastructure is at risk, or there is potential for downstream erosion effects

Analysis of Environmental Effects


PHYSICAL ENVIRONMENT

NET EFFECTS • Nuisance effects from construction activities will be reduced to the extent possible

Mitigation Measures• All temporarily disturbed areas will be

restored and planted with native vegetation

• Proposed habitat restoration of 4,800 m2 (total for 3 Priority Areas)

• Guidelines to reduce risk to migratory birds will be followed

• Species at Risk surveys during detailed design and mitigation in consultation with Ministry of the Environment, Conservation and Parks

• Evaluation of harmful effect to fish habitat during detailed design, then mitigated (in-water timing windows)

Effects• Disturbance of wildlife habitat during

construction• Removal of woodland/forest• Removal of riparian vegetation• Approximate area of habitat removal is

1,900 m2 (total for 3 Priority Areas)• Potential removal of bat maternity roost

habitat• Potential negative impacts to fish

habitat during construction (due to in-water works)

• Potential impacts to Bank Swallow habitat (Area 2)



NATURAL ENVIRONMENT

NET EFFECTS • Re-established vegetation will comprise targeted native vegetation to contribute to heathier

ecosystem. Total net area of habitat enhancement/restoration for the project is ~ 2,900 m2.

Mitigation Measures• Appropriate public notification of

construction works and trail closure• Pedestrian barriers around work areas

and other safety measures to be implemented during construction to ensure public safety

• Coordination with City and Ontario Disc Sports Association to mitigate impacts to the disc golf course

• Stage 2 Archaeological Assessment to be conducted prior to construction

Effects• Temporary closure of trails will impact

accessibility within the parklands• Disruption to park users during

construction• Impacts to disc golf course• Potential to encounter buried cultural

resources (as per Stage 1 Assessment)



CULTURAL ENVIRONMENT

NET EFFECTS • Temporary and minimized impacts to access and enjoyment of recreation areas during

construction, including reduced risk to trail users.

Mitigation Measures• Preferred alternatives to be

implemented by those experienced in natural channel design

• Construction monitoring by fluvial geomorphologist and/or water resource engineer

Effects• Long-term improvements to creek bank

stability and reduction in bank erosion• Protection of at-risk infrastructure (e.g.

sanitary and stormwater infrastructure, trails)

• Maintenance requirements are reduced (Areas 2 and 3)

• Potential for improper design implementation



TECHNICAL/ENGINEERING ENVIRONMENT

NET EFFECTS • Positive effects on long term channel/bank erosion• Improved ability to maintain and protect infrastructure


Next StepsErosion Risk

AnalysisConcept

AlternativesPreferred

AlternativeProject

PlanProject

Approval

2019 - 2020 Fall 2020 Spring/Summer 2021

Summer/Fall 2021

Fall 2021

Provide your comments on the

preferred alternatives and the net project

impacts

Provide your comments on the

Project Plan

Upcoming Public Participation Opportunities

Next Steps:• Incorporate public feedback from PIC #2 and refine the preferred alternative for

each Priority Area• Provide updated preferred alternatives• Publish the Project Plan for public review and comment

We want to hear from you!

• Please fill out the comment form and tell us your thoughts about each Priority Area by Sunday, May 30, 2021.

• Visit the project website (www.trca.ca/seton-park) to fill in the form.


Comment Form

https://forms.office.com/Pages/ResponsePage.aspx?id=b3QkTj7R1kSF60hY9hZSpDow9wBc3NlMicoq0PnaNZBUODVMUkE2NkVLTVFSSjI4VjAzVllKVTdITS4u

http://www.trca.ca/seton-park


QUESTION & ANSWER SESSION (10 minutes)Type in your questions in the Question box.

PROJECT TEAM SPECIALISTSo Ashour Rehana, Manager of Capital & Special Projects, TRCAo Matt Johnston, Associate Director, ERM, TRCAo Michael Brierley, Fluvial Processes Specialist, Palmero Jen Paterson, Ecologist, Palmero Robin McKillop, Principal Fluvial Geomorphologist, Palmer


Stay Connected

Send us your comments through the Comment FormVisit our website: www.trca.ca/seton-park

Sign up for the Project Mailing List

Contact the Project Manager

Divya SasiEmail: [email protected]: 416-661-6600 ext. 6463

https://forms.office.com/Pages/ResponsePage.aspx?id=b3QkTj7R1kSF60hY9hZSpDow9wBc3NlMicoq0PnaNZBUODVMUkE2NkVLTVFSSjI4VjAzVllKVTdITS4u&wdLOR=c2EA5CFFD-0A52-413D-92D0-B9EE1FB12370

http://www.trca.ca/seton-park

mailto:[email protected]

www.trca.ca


Priority Areas and Turtle Habitat Location

E.T. Seton Park Major Maintenance Project

Documents

Transcript of E.T. Seton Park Major Maintenance Project